Cost to duplex upwards?

Dean should definitely chime in here.

Lol....not sure if happy to be known on StreetEasy about duplexing an apartment....or not :)

Hi @Front_porch happy to help answer some questions as we duplexed our apartment (but we went 'down' and took over half of the 3rd floor in 2012) as well as doing a gut renovation of the entire 4th floor here at 135 Henry St Brooklyn Heights in 2008.

Photos are available here - http://bitly.com/135henry

We used Scott Schnall as the architect (no longer working) and Edgar Espinosa 646-932-0515 as the contractor (and highly recommend Edgar/intend to use him again on my next project)

We also replaced our deck last year with iron frame/porcelain tile (used Adam Seim abseim@gmail.com to do this project and highly recommend his design solution/materials - took me forever to find someone who could do this project).

What do you want to know?

I do know that one of the architects we spoke with but didn't go with due to costs did a "build up" renovation that can be found at https://www.wilkinsonarchitects.com/andrew-wilkinson did a "new level" duplexing of his own apartment in Brooklyn so might be worth checking out on his blog posts.

BTW I should have mentioned before.......we are thinking of moving next year (well at least testing the waters at $2.5m)

- https://www.zillow.com/homes/make_me_move/mmm_pt/114314111_zpid/globalrelevanceex_sort/40.73386,-73.938246,40.659285,-74.04811_rect/12_zm/?view=public